Carburetor



@a. 30' 1923. mvzmg B. N. PIERCE cARBUREToR Original Filed Feb. 18, 1915w 2 sheetssheet 1 preferably,

i stants d @ct. 3Q), 1923.

lhlmttlld @F FMCE,

STATES BURT NEULON PIERCE, F BOSTON, MASSACHUSETTS.

CARBUBETOB.

ori ami application filedFebruary 1a, 1915, Serial at. 9,029. nirvanaandthis application filed Janm ery 9, 191a. Serial No. ainoaa.

To all whom it may concern: I

Be it known that l, BURT Neuron Prunes, a citizen of the United States,residing at Boston, in the county of Sufiolk and State of Massachusetts,have invented certain new and useful Improvements in Carburetors, ofwhich the following is a specification, referones being had therein tothe accompanying drawing.

This invention comprises a division of my application for carburetors,Serial-No. 9,029, filed February 18,

l915,'the'object being to provide novel means for heating the chargewhereby the fuel is heated in the main jet and the mixture in thethrottle chamber.

Another object of my invention is to provide a carburetor in which thethrottle chamber is surrounded by a heating chambar to which isdelivered a heating medium from which the same isconveyed to anauxiliary heating chamber surrounding the main nozzle in order to heatthe fuel and air before it is delivered to the mixing chamber.

Other and further objects and advantages of the invention will behereinafter set forth and the novel, features thereof defined by theappended claims.

In the drawings, a

Figure 1 is a front elevation of my improved construction of carburetor;

Figure 2 is a rear elevation;

Figure 3 is a bottom plan view; Figure 4: is a vertical longitudinalsection Figure 5 is a horizontal section; and Figure 6 is a verticaltransverse section. lite erence being had to the accompanying drawings,in which like characters of reference designate corresponding parts onthe several vlews thereof, the carburetor comprises a casing forme d-with a central vertically disposed bore to provide a mixing chamber 16which terminates at its upper end with a reduced bore to provide anoutlet 17 which is siirrounded with a jacket 18, preferably formedintegral with the casing, to provide an annular passage orpocket 19 forthe reception of a suitable heating medium to be admitted theretothrough the connection 20, which heating medium is, the hotexhaust gasesfrom the engine. After flowing through the pocket 19, the heating mediumpasses to an outlet 21 and thence through a discharge tube 22,

disposed vertically of the casing and discharging downwardly, toatmosphere. A suitable plug 23 is threaded into an opening formed in thejacket 18, at a point-diametrically opposite the connection 20, topermit access to the pocket 19 for the purpose of clearing the same ofsuch foreign matter as may collect therein. A pair of threaded openings2%, disposed at opposite sides of' the outlet 17, are provided so thatthe carburetor may be coupled to the adjacent end of the usualconnection (not shown) leading um from passing throu h or into thepocket 19, or, in other words, t e amount or volume of the heatingmedium admitted to the pocket 19 varies inversely with the volume of thegas it is desired to pass through the outlet. The valve 25, of theoutlet 17, is mounted on a shaft 29 which has its opposite endsprojecting through the casing 15 to support, at one end, a stop 30adapted to contact alug 31 when the valve 25 is in full open position,while the other one carries the lever 28. aforesaid, which is formed toprovide the oppositely disposed stops 32 and 33 adapted tocontact a lug34l,'formed on the casing 15, as is also, the lug 31, aforementioned,when the valve 25 is in either its full open or closed position.

Diametrically opposite the lower portion of the casing 15, and ofisettherefrom, are 'formed a float chamber 35 and an air inlet 36, theformer ha ing an open top adapted to receive a cover 37 secured thereonby means of the several screws 38, and is shaped, at its outer end, toprovide arestricted portion 39 in the bottom of which is threaded agasoline, or other liquid fuel, inlet connection 40 formed at its innerend to provide a needle valve seat 41. Formed in the opposite walls ofthe restricted portion 39, immediately adjacent its juncture with thefloat chamber 35, are the bearings ,42 in which is supported or threadeda pintle 43 u on which is carried a lever 4 1 upon one on; of which issecured a float 45 and upon the other of its ends is secured a dependingneedle 46 adapted to have its lower end moved into and out of engagementwith the valve seat 41 of the inlet connection 40 when the float 45 israised or lowered by a corresponding rise or fall. of the liquid fuelin- The air inlet 36 is provided with a disc.

valve 52 formed with a slight cut-away portion-'53 to permit the passageof a small quantity of air to the mixing chamber 16 when the valve'is inits closed position, and is carried by a shaft 54 having one of its endsprojected through the wall of the inlet to support an actuating lever55., A.coi led spring 56 is interposed between the lever 55 and the wallof the inlet and arranged in a manner suitable for maintainin the valvein normally open position, whic is determined by a stop 57, formed withthe casing 15, being engaged by the said actuating lever. 1

For the purpose of introducing the liquid fuel into that part of thecentrally disposed bore of the casing 15, hereinbefore designated as themixing chamber 16, a removable head 58 is adapted to be inserted into.

the bore to the rear of the aforesaid mixing chamber 16 and is clampedin proper position by means of the screws 59 threaded into openingsformed in the shoulders 60 of the casing. A threaded opening 61 isprovided in the bottom wall of the float chamber 35 to receivethe'threaded end of a strainer plug 62, after the latter has been passedthrough an opening formed in a depending portion 63 of the head '58, thestrainer plug 62, when in engagement with the threaded opening 61, actsas a further securing means for clamping the head 58 inposition withrespect to the casing. The plug 62 is provided with a longitudinalpassage 64, extending for a portion of the length thereof, and atransverse passage 65 in communication withthe passage 64 and having itsopposite ends opening through the bottom wall of a circular groove 66formed on the circumference of the plug 62, the open end of the passage64; being covered with a strainer 67 of fine mesh wire screen, or othersuitable material. Thehead 58 is provided with a centrally disposedpassage 68 which establishes communication between the circular groove66 of the plug 62, the main or low speed nozzle' 69, and the auxiliaryor high speed nozzle 70, the said main injector nozzle 69 being arrangedto discharge the main supply of liquid fuel to one side of the mixingchamber 16 while the auxiliary injector nozzle 70 is arranged todischarge a suitable amount of the liquid fuel to the other side of themixing chamber 16, as and for the purpose to be hereinafter set forth.Projecting from the inner face of the head 58 is a semi-cylindrical body71 having a curved cut-away portion 72, the purpose of which will behereinafter fully explained. An opening 73 is provided in the fiat face74, of the body 71, to permit passage therethrough of a current of airto and through a circular space 75, surrounding the main,

nozzle 69, to the mixing chamber. p

Intermediate the ends of the main injector nozzle 69 is formed a valveseat 76 adapted to receive the adjacent end of a needle stem 77 which isadjustably threaded in a nipple 78 projecting outwardly from the outerface of the head 58. .The nipple 78 is exteriorly threaded to receive acap-nut 79, surround ing the needle stem 77, adapted to retain andcompress a packing, ring 80 tightly around the needle stem 77 to preventpossible leakage of the liquid-fuel therefrom.

The head 58.i s provided with a second offset portion 81 which isprovided with an enlarged bore 82 to receive theadjacent end of thedischarge tube 22, aforementioned, a closure 83, pivoted at 84, beingprovided to regulate the exit of the heating medium through the bore 82to atmosphere. A small opening 85, however, may be formed in the coveror closure 83 to prevent the absolute closing of the bore against thepassage of the heating medium therethrough.

To initially heat the liquid fuel passed through the nozzles 69 and 70,a duct 86 connects the bore 82 with a circular passage or dpocket 87formed in the semi-cylindrical b0 y 71, which surrounds the maininjector nozzle 69, and the heating medium, after passing through theocket 87, is discharged therefrom through t e opening 88"formed in theouter wall of the head.

Extending diametrically across the mixing chamber 16 is a valve-shaft89, supported at its opposite ends in suitable bear- 1 ings 90 and 91,and provided intermediate its ends with a slot 92 in which is supportedan air proportioning, flap-valve 93, which may be held in any desiredadjusted position therein, with respect to the curved cutaway portion72, of the semi-cylindrical body 71, of the head 58, by means of thescrews 94, the said flap-valve 93 being adapted for proportioning theamount of air to be admixed with the liquid fuel within the mixingchamber.

One end of the valve-shaft 89 outwardly beyondthe'bearing 91 and isprovided with an arm. having a valve "controlling mechanism connectedthereto, as shown in my application, Serial #9929.

By coupling the engine exhaust (not shown) in any suitable manner to theconnection 20, an efiicient heating of the mixture as .it passes to themanifold of the engine, is obtained, and, as has been hereinbeforeexplained, a valve 26 is provided, in the connection 20, for regulatingthe amount of hot gases, from the exhaust, or, other heating mediumwhich may be employed for the purpose in lieu of such exhaust gases, insuitable proportions to properly condition the fuel or as before thesame is passed to the manifol 1' claim:

- 1. A carbureter for an internal combustion engine comprising a casinghaving a mixing chamber provided with an outlet having a heating jacketsurrounding the same, a member arranged in said casing having an airpassage for delivering air to said mixing chamber, said member having aheatin jacket surrounding the air passage thereof, a fuel nozzleextending into said air passage, means for conveying the heat-- ingmedium from the first mentioned heating jacket t'othe second mentionedheat jacket and means for regulating the volume of heating mediumpassing intothe last mentioned jacket.

2. A carburetor for an internal-combustion engine comprising acasinghaving a said mixing chamber, a nozzle arranged in i said passage, ajacket surrounding said air passage having an inlet and an outlet, apipe connecting the outlet with the first mentioned jacket to the inletof the second mentioned jacket and a movable apertured member arrangedover the outlet of the last mentioned jacket.

3. A carbureter for an internal combus tion engine comprising a casinghaving a mixing chamber having an outlet surrounded b a heat jacket,means for conveying a heating fluid to said heat jacket, a membermounted in said casing having a normally open air passage communicatingwith the mixing chamber, a fuelnozzle extending into said air passage, aheat jacket surrounding said air passage provided with an inlet and anoutlet, and means for conveying a portion ojilthe volume of the heatingfluid to said set: Ind mentioned heat jacket or discharging the same inthe atmosphere. I

In testiniiony whereof I hereunto affix my signature the presence of twowitnesses.

BURT NEULON PIERCE.

Witnesses:

CHARLES M. DOWNES, FRANK J. MGHUGH.

